How many chill hours does 31566 get?

31566 averages 441 chill hours per winter, ranging from 199 to 593 across the last 10 years.

What hardiness zone is 31566?

31566 is in USDA hardiness zone 9a.

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The short answer

31566 averages 441 chill hours per winter (199–593 across 10 years) in USDA zone 9a.

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 31566’s chill hours and zone:

Chill and zone requirements are comfortably met in 31566.

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Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 31566 get?: 31566 averages 441 chill hours per winter, ranging from 199 to 593 across the last 10 years.
What hardiness zone is 31566?: 31566 is in USDA hardiness zone 9a.

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[1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
[2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026